If the suggested looks too comlicated then you could look at changing the configuration of the web browser manually, duckduckgo defaults to no explicit material, or some such, but that would not be a solution. I do not know of any other "denial" programs on linux of the kind you are looking for. It's a diificult one, even the commercial ones for Windoze are a bit ham-fisted and unless you run different users then you end up restricting youself as they tend to pick up on key words in searches.
Fred.
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